US2711686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dewatering aqueous lead sludges
Assignee: EIDP Inc
•
Filing: 1951-06-21
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Granted: 1955-06-28
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Expires: 1971-06-21
Abstract
No abstract record available.
Inventors
- 👤 Mortimer C Denison
- 👤 Whitman Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:07
CPC Classifications
C; C22; C22B; C22B13/00; C22B13/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE PROCESS FOR RECOVERING LEAD IN A DEWATERED AND COMPACTED FORM FROM AN AQUEOUS LEAD SLUDGE COMPRISING ESSENTIALLY A MIXTURE OF LEAD AND FROM ABOUT 3% TO ABOUT 20% BY WEIGHT OF WATER IN WHICH THE LEAD IS IN THE FORM OF SMALL DISCRETE PIECES AND PARTICLES HAVING AN AVERAGE DIAMETER OF LESS THAN 0.1 INCH AND HAVING THEIR SURFACES OXIDIZED, WHICH PROCESS COMPRISES INTRODUCING THE SLUDGES BETWEEN OPPOSING SOLID PRESSURE MEMBERS, COMPRESSING THE SLUDGE AND COMPACTING THE LEAD BETWEEN SUCH MEMBERS UNDER A PRESSURE OF FROM ABOUT 1,000 TO ABOUT 20,000 POUNDS PER SQUARE INCH, AND REMOVING THE WATER FROM THE SLUDGE DURING THE COMPRESSION.
Claim 2
Dependent Claim
106 words
THE PROCESS FOR RECOVERING LEAD IN A DEWATERED AND COMPACTED FORM FROM AN AQUEOUS LEAD SLUDGE COMPRISING ESSENTIALLY A MIXTURE OF LEAD AND FROM ABOUT 3% TO ABOUT 20% BY WEIGHT OF WATER IN WHICH THE LEAD IS IN THE FORM OF SMALL DISCRETE PIECES AND PARTICLES HAVING AN AVERAGE DIAMETER OF LESS THAN 0.1 INCH AND HAVING THEIR SURFACES OXIDIZED, WHICH PROCESS COMPRISES INTRODUCING THE SLUDGES BETWEEN OPPOSING SOLID PRESSURE MEMBERS, COMPRESSING THE SLUDGE AND COMPACTING THE LEAD BETWEEN SUCH MEMBERS UNDER A PRESSURE OF FROM ABOUT 1,000 TO ABOUT 20,000 POUNDS PER SQUARE INCH, AND REMOVING THE WATER FROM THE SLUDGE DURING THE COMPRESSION.
References Cited (Backward Citations)
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Cited
US602866A
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US1149537A
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US1867137A
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US1985598A
Cited
US1819480A
Cited
FR911244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-27 | 1958-12-27 | 1959-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-27 | 1962-12-27 | 1963-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-27 | 1966-12-27 | 1967-06-28 | $7700.00 | Window Closed / Lapsed |